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2019年8月1日 - 金沙编程资讯

全盘转载

#include <iostream>
#include <string>
#include <utility>

using std::cout;
using std::endl;
using std::string;

class  Name
{
public:
    Name(const string & aName) :name{aName}
    {
        cout << "Lvalue Name constructor." << endl;
    }

    Name(string && aName) :name{ std::move(aName) }
    {
        cout << "Rvalue Name constructor." << endl;
    }

    const string & GetNmae()const
    {
        return name;
    }

private:
    string name;

};


class Person
{
public:
    template<typename T1,typename T2>
    Person(T1 && first, T2 && second) :firstname{ std::forward<T1>(first) }, seondname{ std::forward<T2>(second) }
    {
        cout << "-------------------" << endl;
    }

    string getName()const
    {
        return firstname.GetNmae() + " " + seondname.GetNmae();
    }

private:
    Name firstname;
    Name seondname;
};

int main()
{
    Person me{ string{"Ivor"},string{"Horton"} };
    cout << me.getName() << endl << endl;

    string first{"Fred"};
    string second{"Fernackerpan"};
    Person other{first,second};
    cout << other.getName()<< endl << endl;

    Person brother{ first,string{"Bloggs"} };
    cout << brother.getName() << endl << endl;

    Person another{"Richard","Horton"};
    cout << another.getName() << endl;
}

出口结果:

Rvalue Name constructor.

Rvalue Name constructor.

Ivor Horton

Lvalue Name constructor.

Lvalue Name constructor.

Fred Fernackerpan

Lvalue Name constructor.

Rvalue Name constructor.

Fred Bloggs

Rvalue Name constructor.

Rvalue Name constructor.

Richard Horton

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